Multiband VLBI imaging of the jet in 3C 345

Details Multiband VLBI imaging of the jet in 3C 345 Multiband VLBI imaging of the jet in 3C 345

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9523468r&link_type=abstract

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Physics

Dynamic Range, Imaging Techniques, Plasmas (Physics), Quasars, Spectra, Synchrotron Radiation, Very Long Base Interferometry, Disrupting, Jet Flow, Oscillations

Scientific paper

The authors present two high dynamic range images of the quasar 3C 345 from observations at 0avelength 18 cm (1990.74) and a wavelength 49 cm (1990.72). The simultaneous observations at two wavelengths have made it possible to construct a spectral index map covering the core and the extended jet. At a distance of about 15 mas, the jet flares out and the emission beyond this is probably due to optically thick self-absorbed synchrotron radiation, while the radiation downstream is due to emission from an adiabatically expanding plasma. The authors conclude that the flaring out is either due to a standing shock caused by the jet passing into a region of different density, or due to large scale oscillations in a helical jet disrupting the collimated flow.

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